Nervous System - Introduction Flashcards
What are the two Anatomical Classifications for the Nervous System?
- Central Nervous System (CNS)
- Peripheral Nervous System (PNS)
What is the function of the CNS? what parts of the human body contribute to the CNS?
Function - Processing Information - Analyzing Infromation - Generating appropriate motor responses Components - Brain - Spinal Cord
From an embryological perspective, what three parts make up the brain?
- Forebrain
- Midbrain
- Hindbrain
What is the Function of the PNS? What are the components of the PNS?
Function - Collecting sensory information - Distributing Motor output from CNS Components - Cranial Nerves (12 Pairs) - Spinal Nerves (31 pairs) - Peripheral Ganglia: a group of cells outside of the CNS
From a Functional Perspective, what are the Three Components of the Nervous System?
- Somatic
- Visceral
- Enteric
What is the Enteric Nervous System?
- Large Division of PNS
- Controls the Gastrointestinal Behaviour Independently
- Contains the Enteric Plexus
What is the Enteric Plexus?
- Complex autonomic nerve plexus
- Inside walls of the Gastrointestinal Tract
- Contains intrinsic sensory and motor axons connected through local ganglionic interneurons
What is the overall function of the PNS?
- Collect sensory information
- Distribute motor output
What are the Main Sources of Sensory Information? (3)
- Somatic: from the external environment such as pain and temperature
- Special Sense: Fearing, Vision, Balance
- Visceral Senses: From internal Organs
What are the main Motor Outputs of the PNS? examples?
- Somatic Nerves: muscles
- Autonomic Motor Outputs: Cardiac muscles, digestive system, glands
What are the three parts of the Autonomic Motor System?
- Sympathetic Part
- Parasympathetic Part
- Enteric Plexuses
At 3-4 weeks of embryonic development: Describe the CNS
- Hollow Cylinder with Three Vesicles
What are the names of the 3 primary cerebral vesicles present at 3-4 weeks of embryonic development?
- Prosencephalon
- Mesencephalon
- Rhombencephalon
At 5 weeks of embryonic development: describe the CNS
- Secondary Cerebral Vesicles: 5 of them
What are the 5 Secondary Cerebral Vesicles of the CNS at 5 weeks of embryonic development?
- Telencephalon
- Diencephalon
- Mesencephalon
- Metencephalon
- Myelencephalon
What does the Telencephalon turn into?
- Cerebrum